and Miscellaneous Implements at Hall. 
635 
time is often loit in attempting to extricate the engine by steam-power alone, 
and danger is sometimes incnrred by raising the steam pressure above tlie 
jiroper limit. By the contrivance e.\iiibitod in Fig. 11, the engine is pro- 
vided with a powerful hand-jjurchase, by which it may be slowly moved by 
hand-jiower, acting either alone, or in conjunction with the steam-power. A 
crank-handle gives motion to a worm and worm-wheel ; on the axis of the 
worm-wlicel is a spur-pinion, gearing into teeth upon the inner periphery of 
the fly-wheel of the engine. The spur-pinion is strong enough to withstand 
the whole strain due to the steam jiressurc on the piston, that may be loaded 
inadvertently, or with the intention of assisting the hand-gear. By setting a 
man to turn the handle Mjaiiist the steam, the Judges found that he could 
easily overcome the full steam-power of the 10-horse engine, to which the 
apparatus was fitted. 
It will be obvious that this very high power can only be obtained from 
manual labour at a very slow speed ; but the liand-gear is only used for starting 
the engine, and may be thrown out by sliding the pinion along its axis directly 
the wheels are extricated from the hole. The apparatus will also be found 
serviceable in adjusting an engine to drive a threshing machine. The lifting 
gear can be fixed on any form of traction engine, at a cost of about 101. 
The Potato Planter (No. 1242) is manufactured and exhibited by Mr. 
James Coultas, under Wright's patent. Its general arrangements are similar 
to an ordinary turnip-driU, with the seed-box very much enlarged, and, in 
place of the ordinary seed-barrel, furnished with two revolving chains bearing 
wooden blocks, slightly cup-shaped at each end, each chain passing round 
Fig. 12.— Wrl^ihfs Potato-planter, No. 1242. 
